Structure of Be 13 studied in proton knockout from B 14

The neutron-unbound isotope Be13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be13 structure, is a challenge, particularly in light of its bridging role between Be12, where the N=8 neutron shell breaks down, and the Borromean halo nucleus Be14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be12 after proton knockout from B14, by measuring coincidences between Be12, neutrons, and γ rays... (More)